EP2824257B2 - Method for preparation and erection of a tubular tower structure - Google Patents

Description

The invention relates to a method for erecting tubular tower structures.

Tubular tower structures are known, especially as supports for wind turbines. It is particularly known to produce pipe sections from sheet steel and to assemble the pipe sections one above the other with circumferential weld seams to form a pipe tower, which accommodates a wind energy nacelle at its upper end. In order to connect the individual segments to one another, it is known to either weld them or to provide them with circumferential flanges lying one on top of the other in such a way that the flanges lying on top of one another can be screwed together.

In addition, it is known to form such tower structures from partial shells, the partial shells having flanges on their longitudinal edges with which these partial shells are screwed together.

From the WO 2011/092235 A2 a wind turbine tower segment is known, which is also designed as a jacket segment and consists of a reinforced concrete body, with two joints for attaching to joints of at least one further tower segment and at least one connecting body is embedded in the reinforced concrete body in the area of each joint and is anchored therein for connecting to a connecting body adjacent tower segment and the connecting body has a fastening wall arranged essentially parallel to the respective joint for absorbing a tensile load directed transversely to the joint and transversely to the fastening wall. The disadvantage of such a device is that it is relatively complex to cast such concrete shells and also to produce them with precise fit and dimensions. Furthermore, the dismantling of such reinforced concrete towers is quite complex and expensive.

From the DE 10 2010 039 796 A1 a tower with an adapter piece and a method for producing a tower with the adapter piece are known, in which case a lower tubular tower section is also made of concrete and an upper tubular tower section is made of steel. Such hybrid towers are currently preferred for the construction of particularly tall wind turbine towers, since large diameters are possible with the concrete substructure and conventional wind turbine towers can be placed on top of the substructure towers in this way in order to achieve greater heights and thus a better wind yield. However, the disadvantage here is that the dismantling of a concrete tower is relatively complex and the assembly effort for concrete towers is relatively high, especially due to the delivery of concrete.

From the WO 2010/121630 A2 a tower for a wind turbine with a plurality of corner posts to form a custom-made structure is known, the corner posts each being composed of several interconnected partial profiles. Here, the corner posts are each composed of several interconnected partial profiles in such a way that connection areas are formed on adjacent partial profiles, which, however, are bent out of the partial profiles. The disadvantage of this embodiment is that it makes precise and quick work more difficult.

From the DE 10 2009 058 124 B4 A concrete substructure for the tower of a wind turbine is also known.

From the DE 10 2011 603 A1 is a load-carrying device for lifting heavy components or system parts, especially offshore systems.

From the DE 203 21 897 U1 a wind turbine with a stationary vertical mast or tower is known, on which the movable part of the wind turbine is arranged, the mast consisting at least partially of prefabricated wall parts, with several adjacent wall parts forming a substantially annular mast section. The wall parts or segments are made of reinforced concrete or another stone-like material and are already prefabricated. The concrete elements are fastened to one another with the start of tension.

From the DE 10 2011 001 250 A1 a device and method for the transition between a steel tower section and a prestressed concrete tower section are known.

From the DE 10 2011 077 428 A1 a wind turbine tower is known with a plurality of prefabricated tower segments, each of which has an upper and lower horizontal flange, one of the plurality of tower segments having at least two longitudinal flanges, each longitudinal flange having a first side for abutting against a first side of a further longitudinal flange and a second Side which is welded laterally to the lateral surface, the second side being opposite the first side.

From the DE 11 2010 005 382 T5 a wall section for a wind turbine tower is known, wherein the wall section comprises a first wall segment and a second wall segment, as well as a connecting element which has a first surface section which is attached to the first wall segment and extends in a first direction, a second surface section which is attached to the second wall segment is attached and extends in a second direction and comprises an intermediate section with an intermediate surface section extending transversely to the first direction and transversely to the second direction, the connecting element thereby being T-shaped and on a corresponding wall or two on one another abutting wall is placed and fastened to it with screw bolts that protrude through the wall.

From the DE 203 21 855 U1 A tubular tower structure is known, which consists of tubular tower building shells is formed, the tubular tower building shells being produced individually and after the tubular tower building shells have been produced, flanges are welded onto the longitudinal edges of these shells. The structure is then assembled from the shells and screwed to the flanges.

The object of the invention is to create a method with which such tower structures can be erected more quickly and with greater precision and accuracy.

The task is solved using a method with the method steps of claim 1. Advantageous further developments are identified in the dependent claims.

A tower structure constructed according to the invention serves in particular as a substructure tower in order to set up a conventional tower to accommodate wind turbines and thereby achieve a greater height and thus better wind accessibility.

For larger heights of such tower structures, it is necessary to enlarge the tower cross section, as only then can the required stability and buckling resistance be achieved. Such towers are usually created from tower segments with a circular cross-section, placed one above the other and connected to one another. Due to the usual bridge height in Germany, very large tower cross-sections can no longer be realized from one-piece pipe sections or pipe segments.

In order to maintain the clearance height, it is therefore necessary to assemble such very wide towers with a diameter of more than 4.5 m at the base from partial shells, i.e. ring segments, to form a complete ring and - if necessary - to place several of these rings on top of each other.

In principle, it is known to create such so-called longitudinally oriented shells and to assemble these shells into a tube at the installation site. However, it has turned out that the precision and tolerances are so great that assembly is often delayed and made unnecessarily difficult.

According to the invention, the tubular tower structure is first manufactured and erected completely at the place of manufacture, so that the tubular tower structure is constructed in partial lengths that can still be transported or, if the length is still transportable, in its full length. For this purpose, corresponding sheets or blanks are made from sheet steel, which are then rolled so that they abut one another with a longitudinal edge and form a ring segment or a pipe segment. This pipe segment is then welded to this abutting edge. Further pipe segments are placed on top and also welded until a complete pipe tower structure is formed. In this tubular tower structure, flanges are then welded axially from the outside onto the tower structure wall or from the inside onto the tower structure wall, corresponding to a desired number of partial shells, with two flanges lying next to each other always forming a pair of flanges and being welded on. For a tubular tower structure that consists of four partial shells, a total of eight flanges are welded on the outside or inside in four pairs. The pipe is then separated between the respective pairs of flanges into the corresponding partial shells. The partial shells are then transported to the construction site where they are reassembled into a tubular tower structure and connected to each other through the flanges.

The advantage of the invention is that the flanges and the welding of the flanges to the tubular tower structure wall are extremely precise and comprehensibly accurate. In addition, the flanges on the entire tubular tower structure can be aligned and fastened in a particularly good manner in order to achieve a weld. It is also advantageous that these welds and the subsequent separation of the tubular tower structure into the shell elements are carried out under comprehensible conditions at the place of manufacture, whereby a corresponding check can be carried out on the type of manufacture.

At the site of use, the entire tower simply needs to be assembled from, for example, four shells and screwed together.

In addition, it has been found that the method according to the invention, according to which the flanges are welded onto the wall from the inside or outside, results in greater stability than with flanges that are welded to the abutting surface.

Fig. 1a

ein ringförmiges Rohr mit einer Längsschweißnaht als Ausgangsbauwerk;

Fig. 1b

das Rohr nach Fig. 1a mit schematisch dargestellt aufgeschweißten Flanschen;

Fig. 1c

die Situation nach der Trennung in zwei Turmbauwerksschalen zwischen den Flanschpaaren;

Fig. 2

ein Rohrturmbauwerk mit innenliegenden Flanschen, die miteinander verbunden sind;

Fig. 3

ein Rohrturmbauwerk mit außenliegenden Flanschen, die miteinander verbunden sind;

Fig. 4

ein Rohrturmbauwerk aus mehreren Rohrabschnitten, wobei die Trennlinien bzw. Flansche fluchtend angeordnet sind;

Fig. 5

ein Rohrturmbauwerk aus mehreren Rohrabschnitten mit versetzt zueinander verlaufenden Trennlinien bzw. Flanschen;

Fig. 6a

ein Ausschnitt aus einer Rohrturmbauwerkswandung;

Fig. 6b

die Wandung nach Fig. 6a mit einem ersten aufgesetzten und verschweißten Flansch;

Fig. 6c

die Wandung mit einem zweiten aufgesetzten und entlang einer Stoßkante verschweißten Flansch;

Fig. 6d

die Trennlinie in der Wandung des Rohrturmbauwerks zwischen den beiden Flanschen;

Fig. 6e

das zwischen den Flanschen getrennte Rohrturmbauwerk mit einer auf den zweiten Flansch aufgesetzten zweiten Kehlnaht entlang der Stoßkante;

Fig. 7a-f

den Anschluss der Flansche als Vollanschluss;

Fig. 8a-d

Flansche mit Futterblechen;

Fig. 9

das Rohrturmbauwerk in einer Ansicht von außen aus mehreren Rohrsegmenten, die miteinander verschweißt sind;

Fig. 10

den Fuß des Rohrturmbauwerkes mit einem doppelten Ringflansch nach innen und nach außen zur Befestigung auf einem Fundament;

Fig. 11

den Ringflansch mit der Rohrturmbauwerkswandung und einem Teil eines längs verlaufenden Flansches in einer teilgeschnittenen Ansicht;

Fig. 12

den Kopfbereich des Rohrturmbauwerks mit einem innen liegenden Kreisflansch zur Befestigung weiterer Rohrelemente;

Fig. 13

den Kopfbereich des Rohrturmbauwerks in einer teilgeschnittenen Ansicht;

Fig. 14

die Ansicht von innen auf eine Rohrturmbauwerksschale mit je einem längs verlaufenden Flansch an den Längskanten;

Fig. 15

die Rohrturmbauwerksschale nach Fig. 10 in einer teilgeschnittenen Draufsicht auf den Fußbereich mit einem innen und außen verlaufenden Ringflansch;

Fig. 16

den Kopfbereich der Rohrturmbauwerksschale mit einem innen verlaufenden Flansch.

The invention is explained using a drawing as an example. Show it

Fig. 1a

an annular pipe with a longitudinal weld as the starting structure;

Fig. 1b

the pipe Fig. 1a with flanges shown schematically;

Fig. 1c

the situation after separation into two tower structure shells between the pairs of flanges;

Fig. 2

a tubular tower structure with internal flanges that are connected to each other;

Fig. 3

a tubular tower structure with external flanges that are connected to each other;

Fig. 4

a pipe tower structure made up of several pipe sections, with the dividing lines or flanges being arranged in alignment;

Fig. 5

a pipe tower structure made of several pipe sections with offset dividing lines or flanges;

Fig. 6a

a section of a tubular tower building wall;

Fig. 6b

the wall Fig. 6a with a first attached and welded flange;

Fig. 6c

the wall with a second one attached and flange welded along one abutting edge;

Fig. 6d

the dividing line in the wall of the tubular tower structure between the two flanges;

Fig. 6e

the pipe tower structure separated between the flanges with a second fillet weld placed on the second flange along the abutting edge;

Fig. 7a-f

the connection of the flanges as a full connection;

Fig. 8a-d

flanges with lining plates;

Fig. 9

the tubular tower structure in a view from the outside consisting of several tubular segments that are welded together;

Fig. 10

the base of the tubular tower structure with a double ring flange inwards and outwards for attachment to a foundation;

Fig. 11

the ring flange with the tubular tower structure wall and part of a longitudinal flange in a partially sectioned view;

Fig. 12

the head area of the tubular tower structure with an internal circular flange for attaching further tubular elements;

Fig. 13

the head area of the tubular tower structure in a partially sectioned view;

Fig. 14

the view from the inside of a tubular tower structure shell with a longitudinal flange on each of the longitudinal edges;

Fig. 15

the tubular tower structure shell Fig. 10 in a partially sectioned top view of the foot area with an internal and external ring flange;

Fig. 16

the head area of the tubular tower structure shell with an internal flange.

To produce and erect a tubular tower structure, sheet steel of a desired width, length and thickness is bent so that it forms a circular tube or a circular tube section. In the case of very large diameters, individual pipe section segments can be combined with several longitudinal weld seams to form a pipe section ( Fig. 1a ) are welded. Such a pipe section 1 is circular in cross-section and has an axial weld seam 3 connecting them on at least two mutually facing axial edges 2. This forms a circular pipe wall 4, each of which has a radial circumferential end face 5. The axial length of the pipe section 1 is essentially limited by the width of the bent steel sheet and the bending devices available.

The pipe sections 1 are in particular conical, so that the diameter at one axial end is larger than that at the opposite axial end. In this way, a plurality of such conical pipe sections 1 can be used to create conical towers ( Fig. 9 ) achieve. Here, the individual pipe sections 1 have, for example, a height of 1.5 to 3 m, with a pipe section 1 at the foot of a pipe tower structure 6 ( Fig. 9 ) has a diameter of, for example, 7 m and in the area of the head a diameter of 4.5 m. To erect the tubular tower structure 6, the conical pipe sections 1 are placed one above the other and welded all around in the area of their peripheral edges 5.

The method according to the invention provides for one or more axially welded pipe sections 1 to be combined into a transportable length, with suitable transport devices also allowing a complete pipe tower structure 6 to be assembled from pipe sections 1. In order to produce, transport and erect such a tubular tower structure 6, it is necessary to separate such a tubular tower structure 6 lengthwise into longitudinal tubular tower structure shells 6a, since otherwise transport over the road cannot be ensured.

For this purpose, the pipe tower structure 6 or a plurality of axially successive pipe sections 1 is first provided with a pair of longitudinal flanges 7, 8 in the area of desired dividing lines 20. The flanges 7, 8 can be on the outside ( Fig. 3 ) as well as inside ( Fig. 2 ) be arranged along planned dividing lines on the pipe wall 4.

In the simplest case, a pipe tower structure 6 or a pipe section 1 has two dividing lines 20, so that it can be separated into two half-shells 1a, with a flange 7, 8 remaining along an axial edge 11 formed by the separation.

To assemble the flange 7, 8, the flanges 7, 8 can be connected to one another; this connection can be a screw connection through existing screw holes 11 ( Fig. 11 ), be a rivet connection or a stitching with spot welds or short weld seams. Here, the flanges with broad sides 12 can be designed to lie against one another, but so-called lining plates or other spacers 13 can also be present between the flanges 7, 8 ( 8a to 8d ). This ensures good axial alignment and alignment of the flanges.

In a first possible embodiment of the arrangement of the flanges 7, 8 on the inner surface 14 of a wall 4 of a tubular tower structure 6 or a pipe section 1, a first flange 7 is rectangular in cross section and thus has two narrow sides 15, 16 running parallel to one another and two parallel has extending broad sides 12, attached and fixed with a narrow side 15 on the inner surface 14 of the wall 4. This flange is then welded to the surface 14, for example with fillet welds 17. The fillet welds can change the angle between Fill in areas 12 and 14. However, to accommodate the seams, corresponding bevels can also be present in the area between the walls or surfaces 12 and the end face 15 of the flange, so that the seams 17 do not protrude. The second flange 8 is then placed parallel to the first flange 7 on the surface 14 and welded to the surface 14 with at least one fillet weld 18. In this case, the wide surface 12 of the flange 8 opposite the fillet weld 18 is difficult or impossible to reach for welding. In order to produce the corresponding half-shells 1a from the pipe section 1, a separation 20 is carried out along a desired dividing line that runs between the flanges 7, 8 and then the two shells 1a are separated from one another, so that the previously unwelded area of the flange 8 is accessible and can also be connected to the surface 14 with a seam. The edges 21 of the partial shells 1a resulting from the separation and the mutually facing surfaces 12 of the flanges 7, 8 can be designed to be radially aligned. However, the flanges 7, 8 can also be arranged on the surface 14 at a small distance from the edges 21, slightly set back from them.

In a further advantageous embodiment, the flanges 7, 8 are attached to the surface 14 with a so-called full connection ( Fig. 7a to 7f ). Here, the flanges can already be connected to one another for fastening, in particular through screw holes 11 and with their surfaces 12 lying against one another ( Fig. 7a ), however, the flanges can also be arranged individually. In order to ensure full connection, the flanges 7, 8 have sloping end faces 15, so that they only rest on the surface 14 with a very narrow area and a notch results between the flanges 7, 8 and the surface 14, with the flanges arranged next to one another 7, 8 these notches are designed diametrically pointing away from each other. After the flanges have been placed and fixed on the surfaces 14, these notches can each be filled with weld seams 18 so that full connection is guaranteed. A separation 20 or a cutting grinding or thermal separation 20 then takes place, so that edges 21 of the partial shells 1a are formed again and one flange 7 remains in the partial shell 1a, the other flange 8 in the other partial shell 1a.

Particularly in the area in which the two surfaces 12 of the flanges abut each other, or in the area of the notch base 22, a weld seam root 23 can form when welding with full connection, which ultimately also connects the two flanges 7, 8 to one another ( Fig. 7e ).

This weld seam root 23 must be removed in order to separate the two partial shells 1a from each other. This is conveniently achieved by separating ( Fig. 7f ), whereby the separation is carried out through the wall 4 of the pipe section 1 to such an extent that the weld root 23 is also removed, whereupon the partial shells 1a and thus also the flange 7, 8 can be separated from one another. In order to close the resulting gap, which would also occur again when screwing the flanges together, an appropriate lining plate or a seal can be inserted during assembly (between the front edges 21).

Such lining plates or seals are arranged between the flanges 7, 8 or the edges 21 of the half-shells 1a in order to compensate for tolerances or to bring about a seal between the edges 21 or the flanges 7, 8. The lining plates can ( Fig. 8c ) between the flanges 7, 8 and between the edges 21 and extend outwards from the flanges 7, 8 through the wall 4 of the partial shells 1a. If the edges 21 abut each other firmly when assembled ( Fig. 8d ) lining plates can be present between the flanges 7, 8 set back to the edges 21.

In addition, H or double-T sealing elements 24 can be arranged between the edges 21, although these can also be formed in one piece with the lining plates 13.

A corresponding tubular tower structure 6 ( Fig. 9 ) thus has a plurality of dividing lines 20 in the erected state, with which the partial shells 1a consisting of the correspondingly connected segments of the pipe sections 1 are joined together.

To connect such a tubular tower structure 6 with other tubular tower structures or a conventional tubular tower for accommodating a wind turbine, the tubular tower structure has an annular flange 24 on its smaller diameter end face 23. The annular flange 24 preferably consists of annular flange segments 24a, which are finally welded into the partial shells 1a at one end.

Such an annular flange 24 can be provided both at a narrower end of the tubular tower structure 6 and at a wider end of the tubular tower structure 6, in particular if the tubular tower structure 6 is part of a larger tubular tower structure (not shown) and between a wider part underneath and one above it located narrower part is arranged.

Such an annular flange ( Fig. 13 ) is essentially annular with an inner circumferential surface 27, an outer circumferential surface 28, an end face 26 and an end face 29 running parallel to this. In the extension of an outer circumferential wall 28 beyond the end face 29, a connecting ring 30 is formed on the flange 24, which with respect to The radial extent has a thickness that approximately corresponds to the thickness of a wall of a tubular tower structure and is welded to the wall with this ring.

If the tubular tower structure 6 is used as an intermediate part in a larger tubular tower structure, such a flange 24 is also arranged on the wall in the area of the largest diameter of the tubular tower structure.

In one embodiment, in which the tubular tower structure 6 is attached to a foundation, in the area of greatest width, i.e. H. An annular flange 31 is provided on the bottom side on the wall of the tubular tower structure 6. The flange ring 31 is designed as a double ring with two concentric rows of holes 32, 33, the rows of holes 32, 33 being arranged axially with respect to the longitudinal extent of a tubular tower structure. As a result, the flange ring 31 forms a flat contact surface 34, a surface 35 running parallel to this, as well as an inner circumferential end face 36 and an outer circumferential end face 37. Between the end faces 36, 37 approximately in the radial center of the surface 35, an annular web 38 projects from the surface 35, the annular web 38 having a free, circumferential radial edge 39. The ring web 38 has a thickness that corresponds to the thickness of the wall 4 of a tubular tower structure. With the edge 39, the ring web 38 can be welded to a corresponding edge 40 of the tubular tower structure wall 4.

A partial shell 6a of a corresponding tubular tower structure 6 ( Fig. 14 ) is a circular ring segment in cross section ( Fig. 15 partially cut), which is usually conical, so that the circular ring segment extends from a lower area ( Fig. 15 ) to an upper area ( Fig. 16 ) rejuvenated.

The tubular tower structure segment 6a has a flange 7, 8 on each axial edge in the manner already described for connecting several segments, the flanges 7, 8 correspondingly having rows of holes through which the flanges 7, 8 can be connected to one another. The connection can generally be made using screws, rivets and welds. So-called locking ring bolts, which are ultimately screws placed on a threaded press sleeve and are maintenance-free or low-maintenance, have proven to be cheap.

A tubular tower structure segment produced in the shape or a tubular tower structure shell 6a produced in this way has the already mentioned flanges 24, 31 at the upper and lower ends. The shells 6a are thus formed from a plurality of partial shells 1a or pipe sections 1a, the pipe sections 1a each having abutting edges 5 are placed on top of each other and welded together. Ring frames 40 or ring clamping segments 40 can be welded in approximately in the axial center between two abutting edges 5 for stabilization and, if necessary, for arranging components within a tower. In addition, a longitudinal frame 41 can be welded in the radial center between the two flanges 7, 8, which extends over the entire length or part of the length of the partial shell 6a.

The advantage of the invention is that a tubular tower structure 6 is manufactured entirely from tubular sections 1a, 6a, which are in particular conical, in a corresponding manufacturing facility. Under predetermined conditions, which allow the smallest tolerances, flanges, which extend longitudinally or axially, are welded to the outside or inside of the pipe wall 4 and then the pipe tower structure between the flanges is separated into at least two partial shells 6a, preferably more partial shells 6a, in particular four to fourteen partial shells 6a , which are easy to transport, even on roads.

At an erection point of the tubular tower structure, the partial shells are connected to one another again, and this is done in a particularly simple manner since the partial shells are matched to one another with an absolutely precise fit. In contrast to conventional construction concepts, in which such a tubular tower structure is assembled and welded from individual pipe sections or pipe sections, the assembly of such a tubular tower structure can be done in a fraction of the assembly time, with a pipe tower structure with very large diameters, in particular diameters at the base <7 m, also being realized can be.

It is particularly advantageous that with such a tubular tower structure, a very high substructure for known tubular towers that carry wind turbines can be created in a simple, cost-effective and quick-to-assemble manner, so that conventional wind turbines can be brought higher into the wind and thus increase their effectiveness can be increased.

Claims (12)

1. Method for erecting a tubular tower construction, wherein

   - steel sheet is bent into a tube section (1a, b) which is essentially annular in cross-section and is welded along a longitudinal edge (2) to form a closed tube (1a, b),

   - at the tube (6), along planned axial lines of separation, respectively one pair of axial flanges (7, 8) are welded inside or outside onto the tube wall, wherein respectively one pair of flanges (7, 8) are arranged extending axially and lying side by side in the circumferential direction,

   - wherein the tube body (6) is separated along planned lines of separation (20), which extend between two flanges (7, 8) of a flange pair, so that at least two partial shells (6a) of the tube body are formed, which comprise respectively one flange (7, 8) along axial edges (11) and

   - for erecting the tower construction, the partial shells (6a) are arranged one against the other and connected through the flanges (7, 8) of a pair of flanges to form a tube body.
2. Method according to claim 1, characterized in that
   a plurality of tube sections (1a), which are annular in cross-section, are connected along common circumferential edges (5) to a longitudinally extending tube body (6).
3. Method according to claim 1 or 2, characterized in that
   the tube sections (1a) are arranged in such a way that their respective flange pairs or flanges and / or longitudinal weld seams are offset in the axial direction and are not aligned with one another.
4. Method according to one of the preceding claims, characterized in that
   Annular frames/annular frame segments (40) and / or annular flanges or annular flange segments (24, 31) are arranged between the flanges (7, 8) of a partial shell (6a), wherein the annular flanges (24, 31) are arranged for the connection of axially successive tube sections (6) and are aligned with radially extending circumferential edges.
5. Method according to one of the preceding claims, characterized in that
   first a flange (7) of a flange pair (7, 8) is placed on an inner or outer side (14) of the tube wall (4) and is connected with the tube body by means of a first fillet seam (18) along a joint edge, and then the opposite joint edge is welded together with the tube body by means of a fillet seam (18), and subsequently the second flange (8) of the pair of flanges (7, 8) is arranged abutting the first flange (7) or slightly spaced apart therefrom by means of a fillet seam (18), in particular spaced apart with a distance corresponding to the width of a separation tool, wherein the fillet seam is opposite the first flange of the pair of flanges and afterwards the separation takes place between the two flanges (7, 8) of the pair of flanges, wherein the second flange (8) is attached to the tube body by means of the second fillet seam (18) after the separation.
6. Method according to one of claims 1 to 4, characterized in that a flange (7, 8) or both flanges (7, 8) are placed on an inner or outer side of the tube wall, wherein the flanges (7, 8) are respectively placed with an abutting face (15) in such a way, and the abutting face (15) extends in such a way, that a wedge-shaped gap is formed with the tube wall, and the flanges are subsequently welded to the wall (4) one after the other or simultaneously with a full connection seam.
7. Method according to one of the preceding claims,
   characterized in that the separation takes place in such a way that the axial edge of the half-shell is aligned with the abutting edge of the flange so that the flanges of the adjacent half-shells are arranged immediately adjacent to one another when a tower construction is to be erected.
8. Method according to one of the preceding claims,
   characterized in that the separation takes place in such a way that in the case of flanges which are welded with a full connection and have a common weld seam root the weld seam root is removed during the separation so that the flanges (7, 8) or the partial shells (6a) can be lifted from each other.
9. Method according to one of the preceding claims,
   characterized in that the flange pairs or the flanges of adjoining tower construction shells are connected with bolts, rivets, screws with press sleeves or locking ring bolts.
10. Method according to one of the preceding claims,
    characterized in that the tower construction has a first diameter at an axial end and a second diameter at an axially opposite end, the first diameter being greater than the second diameter.
11. Method according to one of the preceding claims,
    characterized in that the smaller diameter is chosen so as to correspond to the standard diameter of wind energy installations in their foot, so that a standard tower of a wind energy installation can be placed on the section with the smaller diameter of the tube structure and fastened.
12. Method according to one of the preceding claims,
    characterized in that the tubular tower construction (6) is formed from two to fourteen prefabricated partial shells and has a foot diameter of 4 to 14 m and a head diameter of 2.5 to 10 m.

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